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Re: BUG: pg_stat_statements query normalization issues with combined queries
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* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-12 13:12  Kyotaro HORIGUCHI <[email protected]>
  0 siblings, 1 reply; 1109+ messages in thread

From: Kyotaro HORIGUCHI @ 2017-01-12 13:12 UTC (permalink / raw)
  To: [email protected]; +Cc: [email protected]; [email protected]; [email protected]; pgsql-hackers

Hello,

At Fri, 30 Dec 2016 15:10:42 +0100 (CET), Fabien COELHO <[email protected]> wrote in <alpine.DEB.2.20.1612301453280.32017@lancre>
> 
> Hello,
> 
> >> Yeah, that's what I was thinking of.  There aren't very many places
> >> that
> >> would need to know about that, I believe; [...]
> >
> > For fixing the information in pg_stat_statement, the location data
> > must be transported from the parsed node to the query to the planned
> > node, because the later two nodes types are passed to different hooks.
> >
> > Now the detail is that utility statements, which seems to be nearly
> > all of them but select/update/delete/insert, do not have plans: The
> > statement itself is its own plan... so there is no place to store the
> > location & length.
> 
> Here is an updated version:
> 
> Changes wrt v2:
> 
>  - I have added the missing stuff under /nodes/, this is stupid code that
>    should be automatically generated:-(
>
>  - I have added comments in "gram.y" about how the length is computed.
>    I have also slightly simplified the rule code there.
> 
>  - I have rename "location" in create table space to "location_dir"
>    to avoid confusion.
> 
>  - I have renamed the fields "location" and "length" instead of q*.
> 
>  - I have moved the location & lenth copies in standard_planner.
> 
>  - I have fixed the function declaration typo.
> 
>  - I have simplified pgss_store code to avoid a copy, and move the
>    length truncation in qtext_store.
> 
>  - I have improved again the pg_stat_statement regression tests with
>    combined utility statement tests, which implied some fixes to
>    extract the right substring for utility queries.
> 
> However, not changed:
> 
>  - I cannot use the intermediate node trick suggested by Tom because
>    it does not work for utility statements which do not have plans, so
>    the code still adds location & length, sorry.

Wrapping the output of pg_parse_query still works for non-utility
commands. But pg_stat_statement retrieves the location
information via ProcessUtility, which has plantree. Wrapping
plantree with the same struct also works but it imacts too widely
and extremely error-prone.

One available solution is, as Fabien did, bring location and
length data along with transformation.  And anther is give a
chopped query to query tree.

The attached patch does the second way (but quite ugly and
incomplete, it's PoC). This seems working as expected to a
certain degree but somewhat bogus..  A significant drawback of
this is that this makes a copy of each query in multistatement.

>  - I still use the 'last_semicolon' lexer variable. The alternative is to
>    change rules so as not to skip empty statements, then write a loop to
>    compute the length based on successor location, and remove the empty
>    statements. It can be done, I do not think it is better, it is only
>    different and more verbose. I'll do it if required by a committer.

I think this is doable in the way shown in this patch. But this
seems somewhat bogus, too..

regards,

-- 
Kyotaro Horiguchi
NTT Open Source Software Center


^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-12 14:29  Tom Lane <[email protected]>
  parent: Kyotaro HORIGUCHI <[email protected]>
  0 siblings, 1 reply; 1109+ messages in thread

From: Tom Lane @ 2017-01-12 14:29 UTC (permalink / raw)
  To: Kyotaro HORIGUCHI <[email protected]>; +Cc: [email protected]; [email protected]; [email protected]; pgsql-hackers

Kyotaro HORIGUCHI <[email protected]> writes:
> At Fri, 30 Dec 2016 15:10:42 +0100 (CET), Fabien COELHO <[email protected]> wrote in <alpine.DEB.2.20.1612301453280.32017@lancre>
>> - I cannot use the intermediate node trick suggested by Tom because
>> it does not work for utility statements which do not have plans, so
>> the code still adds location & length, sorry.

I still really, really don't like this patch.  I think it's going to
create continuing maintenance problems, because of shortcuts like this:

+#define isParseNodeTag(tag)	((T_Query <= (tag)) && ((tag) < T_A_Expr))

We've never had any code that depends on ranges of nodetag numbers, and
now is not the time to start.  (The fact that you had to randomly relocate
some existing tags to make this work didn't make me any happier about it.)

>> - I still use the 'last_semicolon' lexer variable. The alternative is to
>> change rules so as not to skip empty statements, then write a loop to
>> compute the length based on successor location, and remove the empty
>> statements. It can be done, I do not think it is better, it is only
>> different and more verbose. I'll do it if required by a committer.

> I think this is doable in the way shown in this patch. But this
> seems somewhat bogus, too..

Yeah, I doubt that this technique for getting the raw locations in the
grammar+lexer works reliably.  In general, Bison is a bit asynchronous
in terms of scanning, and may or may not have scanned a token ahead of
what the current production covers.  So having production rules that
look at the scanner state is just dangerous.  You should be relying on
the Bison locations mechanism (@N), instead.  That has some gotchas of
its own with respect to locations of nonterminals, but at least they're
known --- and we could fix them if we had to.


Anyway, I decided to see what it would take to do it the way I had
in mind, which was to stick a separate RawStmt node atop each statement
parsetree.  The project turned out a bit larger than I hoped :-(, but
I'm really pleased with the end result, because it makes the APIs around
lists of statements much simpler and more regular than they used to be.
I would probably propose most of the attached patch for adoption even
if we weren't interested in tracking statement boundaries.

In brief, what this does is:

* The output of raw parsing is now always a list of RawStmt nodes;
the statement-type-dependent nodes are one level down from that.
This is similar to the existing rule that the output of parse analysis
is always a list of Query nodes, even though the Query struct is mostly
empty in the CMD_UTILITY case.  Furthermore, the output of pg_plan_queries
is now always a list of PlannedStmt nodes, even for utility statements.
In the case of a utility statement, "planning" just consists of wrapping
a CMD_UTILITY PlannedStmt around the utility node.  Now, every list of
statements has a consistent head-node type depending on how far along
it is in processing.

* This allows us to keep statement location/length in RawStmt, Query,
and PlannedStmt nodes, and not anywhere else.

* This results in touching quite a bit of code that is concerned with
lists of statements in different formats, but in most places, it's
simple changes like replacing generic Node* pointers with specific
RawStmt* or PlannedStmt* pointers.  I think that's an unalloyed good.

* To preserve the new rule that the node passed to top-level
parse_analyze() is now always a RawStmt, I made the grammar insert
RawStmts in the sub-statements of EXPLAIN, DECLARE CURSOR, etc.
This adds a bit of cruft in gram.y but avoids cruft elsewhere.

* In addition, I had to change the API of ProcessUtility() so that
what it's passed is the wrapper PlannedStmt not just the bare
utility statement.  This is what allows pg_stat_statements to get at
the location info for a utility statement.  This will affect all
users of ProcessUtility_hook, but the changes are pretty trivial
for those that don't care about location info --- see the changes
to contrib/sepgsql/hooks.c for an example.

* Because PlannedStmt also carries a canSetTag field, we're able to
get rid of some ad-hoc rules about how to reconstruct canSetTag for
a bare utility statement (specifically, the assumption that a utility
is canSetTag if and only if it's the only one in its list).  While
I see no near-term need for relaxing that, it's nice to get rid of the
ad-hocery.

* I chose to also rearrange the post-parse-analysis representation
of DECLARE CURSOR so that it looks more like EXPLAIN, PREPARE, etc.
That is, the contained SELECT remains a child of the DeclareCursorStmt
rather than getting flipped around to be the other way.  Possibly this
patch could have been made to work without that, but the existing code
had some weird rules about how the presence of a PlannedStmt where a
utility command was expected meant it was DECLARE CURSOR, and I was out
to get rid of weird rules like that one.  With these changes, it's
true for both Query and PlannedStmt that utilityStmt is non-null if
and only if commandType is CMD_UTILITY.  That allows simplifying a
whole lot of places that were testing both fields --- I think a few
of those were just defensive programming, but in a lot of them, it was
actually necessary to avoid confusing DECLARE CURSOR with SELECT.

So this ends up costing one extra palloc per statement, or two extra
in the case of a utility statement, but really that's quite negligible
compared to everything else that happens in processing a statement.
As against that, I think it makes the related code a lot clearer.
The sheer size of the patch is a bit more than Fabien's patch, but
what it is touching is not per-statement-type code but code that
works generically with lists of statements.  So I think it's less
likely to cause problems for other patches.

			regards, tom lane



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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-12 18:00  Fabien COELHO <[email protected]>
  parent: Tom Lane <[email protected]>
  0 siblings, 2 replies; 1109+ messages in thread

From: Fabien COELHO @ 2017-01-12 18:00 UTC (permalink / raw)
  To: Tom Lane <[email protected]>; +Cc: Kyotaro HORIGUCHI <[email protected]>; [email protected]; [email protected]; pgsql-hackers


Hello Tom,

> Yeah, I doubt that this technique for getting the raw locations in the
> grammar+lexer works reliably.

It worked reliably on all tests, and the assumption seemed sound to me, 
given the one-look-ahead property and that statement reductions can only 
triggered when ';' or end of input comes.

> Anyway, I decided to see what it would take to do it the way I had
> in mind, which was to stick a separate RawStmt node atop each statement
> parsetree.  The project turned out a bit larger than I hoped :-(,

Indeed: I tried it as it looked elegant, but it did not show to be the 
simple thing you announced...

> [...] Furthermore, the output of pg_plan_queries is now always a list of 
> PlannedStmt nodes, even for utility statements.

I stopped exactly there when I tried: I thought that changing that would 
be enough to get a reject because it would be considered much too invasive 
in too many places for fixing a small bug.

> So this ends up costing one extra palloc per statement, or two extra
> in the case of a utility statement, but really that's quite negligible
> compared to everything else that happens in processing a statement.

> As against that, I think it makes the related code a lot clearer.

Having spent some time there, I agree that a refactoring and cleanup was 
somehow needed...

> The sheer size of the patch is a bit more than Fabien's patch,

Yep, nearly twice as big and significantly more complex, but the result is 
a definite improvement.

> but what it is touching is not per-statement-type code but code that 
> works generically with lists of statements.  So I think it's less likely 
> to cause problems for other patches.

Patch applies (with "patch", "git apply" did not like it though), 
compiles, overall make check ok, pgss make check ok as well. I do not know 
whether the coverage of pg tests is enough to know whether anything is 
broken...

I noticed that you also improved the pgss fix and tests. Good. I was 
unsure about removing spaces at the end of the query because of possible 
encoding issues.

The update end trick is nice to deal with empty statements. I wonder 
whether the sub "query" in Copy, View, CreateAs, Explain, Prepare, 
Execute, Declare... could be typed RawStmt* instead of Node*. That would 
avoid some casts in updateRawStmtEnd, but maybe add some other elsewhere.

One point bothered me a bit when looking at the initial code, that your 
refactoring has not changed: the location is about a string which is not 
accessible from the node, so that the string must be kept elsewhere and 
passed as a second argument here and there. ISTM that it would make some 
sense to have the initial string directly available from RawStmt, Query 
and PlannedStmt.

-- 
Fabien.


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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-12 18:25  Tom Lane <[email protected]>
  parent: Fabien COELHO <[email protected]>
  1 sibling, 2 replies; 1109+ messages in thread

From: Tom Lane @ 2017-01-12 18:25 UTC (permalink / raw)
  To: Fabien COELHO <[email protected]>; +Cc: Kyotaro HORIGUCHI <[email protected]>; [email protected]; [email protected]; pgsql-hackers

Fabien COELHO <[email protected]> writes:
>> [...] Furthermore, the output of pg_plan_queries is now always a list of 
>> PlannedStmt nodes, even for utility statements.

> I stopped exactly there when I tried: I thought that changing that would 
> be enough to get a reject because it would be considered much too invasive 
> in too many places for fixing a small bug.

Well, I don't know that we'd have bothered to change this without a
reason, but now that the effort's been put in, it seems a lot cleaner
to me.

> I noticed that you also improved the pgss fix and tests. Good. I was 
> unsure about removing spaces at the end of the query because of possible 
> encoding issues.

It's safe in backend-legal encodings.  I agree it could be problematic
in, say, SJIS, but we disallow that as a backend encoding precisely
because of this type of hazard.

> The update end trick is nice to deal with empty statements. I wonder 
> whether the sub "query" in Copy, View, CreateAs, Explain, Prepare, 
> Execute, Declare... could be typed RawStmt* instead of Node*.

I did that for some of them, eg CopyStmt.  The trouble for statements like
EXPLAIN is that we replace the sub-statement during parse analysis, so
that the field points to either a raw grammar output node or to a Query
depending on when you look.  If we wanted to get rid of using a Node*
field there, we'd have to invent two separate struct types to represent
raw EXPLAIN and post-parse-analyze EXPLAIN (analogously to the way that,
say, ColumnRef and Var are distinct node types).  It doesn't seem worth
the trouble to me.

> One point bothered me a bit when looking at the initial code, that your 
> refactoring has not changed: the location is about a string which is not 
> accessible from the node, so that the string must be kept elsewhere and 
> passed as a second argument here and there. ISTM that it would make some 
> sense to have the initial string directly available from RawStmt, Query 
> and PlannedStmt.

Yeah, perhaps, but that would be something to tackle as a separate round
of changes I think.  This might also tie into the nearby thread about
having that string available to pass to parallel workers.  The history
here is that we didn't use to keep the source string around after parsing,
but that's not the case anymore.  But we've not entirely accepted that
in all the internal APIs ...

			regards, tom lane


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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-12 18:41  Tom Lane <[email protected]>
  parent: Tom Lane <[email protected]>
  1 sibling, 1 reply; 1109+ messages in thread

From: Tom Lane @ 2017-01-12 18:41 UTC (permalink / raw)
  To: Fabien COELHO <[email protected]>; +Cc: Kyotaro HORIGUCHI <[email protected]>; [email protected]; [email protected]; pgsql-hackers

I wrote:
> Fabien COELHO <[email protected]> writes:
>> One point bothered me a bit when looking at the initial code, that your 
>> refactoring has not changed: the location is about a string which is not 
>> accessible from the node, so that the string must be kept elsewhere and 
>> passed as a second argument here and there. ISTM that it would make some 
>> sense to have the initial string directly available from RawStmt, Query 
>> and PlannedStmt.

> Yeah, perhaps, but that would be something to tackle as a separate round
> of changes I think.

I remembered one reason why we haven't done this: it's unclear how we'd
handle copying if we do it.  If, say, Query contains a "char *" pointer
then you'd expect copyObject() to pstrdup that string, but we really don't
want that to happen in scenarios where a single source string generated a
large number of Query trees.  That's not an academic concern, we've gotten
real field bug reports when we broke it --- cf commit 1591fcbec.  We'd
need to work out a way of managing multiple Queries carrying references
to the same source string, and it's not clear how to do that reasonably.
So for now, it remains the path of least resistance for Portals and
CachedPlans to contain a list of Query or PlannedStmt objects and a
separate source string.

			regards, tom lane


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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-12 19:02  Fabien COELHO <[email protected]>
  parent: Tom Lane <[email protected]>
  1 sibling, 0 replies; 1109+ messages in thread

From: Fabien COELHO @ 2017-01-12 19:02 UTC (permalink / raw)
  To: Tom Lane <[email protected]>; +Cc: Kyotaro HORIGUCHI <[email protected]>; [email protected]; [email protected]; pgsql-hackers


> [...] it seems a lot cleaner to me.

I agree.

> [...] It's safe in backend-legal encodings.

Good:-)

> [...] The trouble for statements like EXPLAIN is that we replace the 
> sub-statement during parse analysis, [...]

Ok. So Node* is fine to keep it generic.

-- 
Fabien.


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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-12 19:08  Fabien COELHO <[email protected]>
  parent: Tom Lane <[email protected]>
  0 siblings, 1 reply; 1109+ messages in thread

From: Fabien COELHO @ 2017-01-12 19:08 UTC (permalink / raw)
  To: Tom Lane <[email protected]>; +Cc: Kyotaro HORIGUCHI <[email protected]>; [email protected]; [email protected]; pgsql-hackers


About having a pointer to the initial string from RawStmt, Query & 
PlannedStmt:

> I remembered one reason why we haven't done this: it's unclear how we'd 
> handle copying if we do it. If, say, Query contains a "char *" pointer 
> then you'd expect copyObject() to pstrdup that string, [..., So] We'd 
> need to work out a way of managing multiple Queries carrying references 
> to the same source string, and it's not clear how to do that reasonably.

For me it would be shared, but then it may break some memory management 
hypothesis downstream.

> So for now, it remains the path of least resistance for Portals and 
> CachedPlans to contain a list of Query or PlannedStmt objects and a 
> separate source string.

Ok. Thanks for the explanation.

-- 
Fabien.


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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-13 08:34  Kyotaro HORIGUCHI <[email protected]>
  parent: Fabien COELHO <[email protected]>
  1 sibling, 1 reply; 1109+ messages in thread

From: Kyotaro HORIGUCHI @ 2017-01-13 08:34 UTC (permalink / raw)
  To: [email protected]; +Cc: [email protected]; [email protected]; [email protected]; pgsql-hackers

Hello,

It is big, but I think quite reasonable. The refactoring makes
many things clearer and I like it. No objection for the
patch. The affect of changing some API's are not a problem.

At Thu, 12 Jan 2017 19:00:47 +0100 (CET), Fabien COELHO <[email protected]> wrote in <alpine.DEB.2.20.1701121752430.3788@lancre>
> Patch applies (with "patch", "git apply" did not like it though),
> compiles, overall make check ok, pgss make check ok as well. I do not
> know whether the coverage of pg tests is enough to know whether
> anything is broken...

The same for me. There's some parts that I haven't fully
understand, though..

> I noticed that you also improved the pgss fix and tests. Good. I was
> unsure about removing spaces at the end of the query because of
> possible encoding issues.
> 
> The update end trick is nice to deal with empty statements. I wonder
> whether the sub "query" in Copy, View, CreateAs, Explain, Prepare,
> Execute, Declare... could be typed RawStmt* instead of Node*. That
> would avoid some casts in updateRawStmtEnd, but maybe add some other
> elsewhere.
> 
> One point bothered me a bit when looking at the initial code, that
> your refactoring has not changed: the location is about a string which
> is not accessible from the node, so that the string must be kept
> elsewhere and passed as a second argument here and there. ISTM that it
> would make some sense to have the initial string directly available
> from RawStmt, Query and PlannedStmt.

I found an inconsistency (in style, not function:) between
copyfuncs and equalfuncs. The patch handles the three members
utilityStmt, stmt_location and stmt_len of Query at once and
copyfuncs seems to be edited to follow the rule, but in
equalfuncs the position of utilityStmt is not moved.

regards,

-- 
Kyotaro Horiguchi
NTT Open Source Software Center




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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-13 08:35  Kyotaro HORIGUCHI <[email protected]>
  parent: Fabien COELHO <[email protected]>
  0 siblings, 1 reply; 1109+ messages in thread

From: Kyotaro HORIGUCHI @ 2017-01-13 08:35 UTC (permalink / raw)
  To: [email protected]; +Cc: [email protected]; [email protected]; [email protected]; pgsql-hackers

Hello,

At Thu, 12 Jan 2017 20:08:54 +0100 (CET), Fabien COELHO <[email protected]> wrote in <alpine.DEB.2.20.1701122004190.3788@lancre>
> 
> About having a pointer to the initial string from RawStmt, Query &
> PlannedStmt:
> 
> > I remembered one reason why we haven't done this: it's unclear how
> > we'd handle copying if we do it. If, say, Query contains a "char *"
> > pointer then you'd expect copyObject() to pstrdup that string, [...,
> > So] We'd need to work out a way of managing multiple Queries carrying
> > references to the same source string, and it's not clear how to do
> > that reasonably.
> 
> For me it would be shared, but then it may break some memory
> management hypothesis downstream.

+1 to they have a pointer to the shared query string. But doing
that without some measure like reference counting seems
difficult..

regards,

-- 
Kyotaro Horiguchi
NTT Open Source Software Center




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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-13 14:01  Tom Lane <[email protected]>
  parent: Kyotaro HORIGUCHI <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Tom Lane @ 2017-01-13 14:01 UTC (permalink / raw)
  To: Kyotaro HORIGUCHI <[email protected]>; +Cc: [email protected]; [email protected]; [email protected]; pgsql-hackers

Kyotaro HORIGUCHI <[email protected]> writes:
> I found an inconsistency (in style, not function:) between
> copyfuncs and equalfuncs. The patch handles the three members
> utilityStmt, stmt_location and stmt_len of Query at once and
> copyfuncs seems to be edited to follow the rule, but in
> equalfuncs the position of utilityStmt is not moved.

I think you're looking at struct Query's instance of utilityStmt.
I didn't move that one.  (Maybe I should've, but it didn't
look quite as randomly dropped into the middle of the struct
as the PlannedStmt one did.  Just a judgment call in either case.)

			regards, tom lane


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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-13 14:08  Craig Ringer <[email protected]>
  parent: Kyotaro HORIGUCHI <[email protected]>
  0 siblings, 1 reply; 1109+ messages in thread

From: Craig Ringer @ 2017-01-13 14:08 UTC (permalink / raw)
  To: Kyotaro HORIGUCHI <[email protected]>; +Cc: Robert Haas <[email protected]>; Tom Lane <[email protected]>; Fabien COELHO <[email protected]>; pgsql-hackers

On 13 Jan. 2017 16:35, "Kyotaro HORIGUCHI" <[email protected]>
wrote:

Hello,

At Thu, 12 Jan 2017 20:08:54 +0100 (CET), Fabien COELHO <[email protected]>
wrote in <alpine.DEB.2.20.1701122004190.3788@lancre>
>
> About having a pointer to the initial string from RawStmt, Query &
> PlannedStmt:
>
> > I remembered one reason why we haven't done this: it's unclear how
> > we'd handle copying if we do it. If, say, Query contains a "char *"
> > pointer then you'd expect copyObject() to pstrdup that string, [...,
> > So] We'd need to work out a way of managing multiple Queries carrying
> > references to the same source string, and it's not clear how to do
> > that reasonably.
>
> For me it would be shared, but then it may break some memory
> management hypothesis downstream.

+1 to they have a pointer to the shared query string. But doing
that without some measure like reference counting seems
difficult..



Sounds like it'd be better as a separate change so as not to block this one.

I really like what you have done Tom, though I'm about to travel so I
haven't read it in full detail. Like Fabien I would've been certain that
it'd be rejected if I tried it, but I sure am glad you did it.


^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-13 14:44  Tom Lane <[email protected]>
  parent: Craig Ringer <[email protected]>
  0 siblings, 1 reply; 1109+ messages in thread

From: Tom Lane @ 2017-01-13 14:44 UTC (permalink / raw)
  To: Craig Ringer <[email protected]>; +Cc: Kyotaro HORIGUCHI <[email protected]>; Robert Haas <[email protected]>; Fabien COELHO <[email protected]>; pgsql-hackers

Craig Ringer <[email protected]> writes:
> Sounds like it'd be better as a separate change so as not to block this one.

Yeah, if we do that at all it should be a separate patch IMO.  The
concerns are largely different.

> I really like what you have done Tom, though I'm about to travel so I
> haven't read it in full detail. Like Fabien I would've been certain that
> it'd be rejected if I tried it, but I sure am glad you did it.

Does anyone want to do further review on this before I push it?

One thing that I'm not quite satisfied with is the business with
non-top-level RawStmt nodes in some utility statements.  That's certainly
a wart from gram.y's perspective, and it's mostly a wart from analyze.c's
perspective as well --- the parse analyze routines mostly just throw away
the non-top-level RawStmt.

The original reason for doing it was that DoCopy needs to call
pg_analyze_and_rewrite() on the sub-statement, and I wanted
pg_analyze_and_rewrite's argument to be declared as RawStmt, so CopyStmt's
sub-statement had to have a RawStmt.  And it seemed like a good idea for
the other utility statements to be consistent with that.

However, when all the dust settled, DoCopy ended up needing to construct
a RawStmt node anyway for the case where it's inventing a Query tree to
support an RLS query.  We could make it construct a RawStmt node in the
plain copy-from-query case too, and then there needn't be one in the
grammar output.

So I'm now thinking that it might be better if the grammar produced
RawStmt only at top level, and anybody who calls pg_analyze_and_rewrite
on sub-sections of a utility statement has to cons up a RawStmt to put
at the top of the sub-query.  This complicates life a little for utility
statements that call parse analysis during execution, but the principle
that RawStmt appears only at top level seems attractively simple.
We don't nest PlannedStmts either.

One thing that connects into this is why do we have some utility
statements that do parse analysis of sub-statements immediately during
their own parse analysis, while others postpone that to execution?
I've not researched it yet, but my vague memory is that EXPLAIN and
friends used to all do it in the second way, and we realized that that
was broken so we changed them to the first way.  COPY has only recently
grown the ability to have a sub-query, and I'm wondering if it's just a
failure of institutional memory that led us to do it the second way.
If we ended up requiring all these cases to work more like EXPLAIN,
they'd not be needing to construct RawStmts at execution anyway.

			regards, tom lane


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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-13 17:00  Fabien COELHO <[email protected]>
  parent: Tom Lane <[email protected]>
  0 siblings, 1 reply; 1109+ messages in thread

From: Fabien COELHO @ 2017-01-13 17:00 UTC (permalink / raw)
  To: Tom Lane <[email protected]>; +Cc: Craig Ringer <[email protected]>; Kyotaro HORIGUCHI <[email protected]>; Robert Haas <[email protected]>; pgsql-hackers


> One thing that I'm not quite satisfied with is the business with
> non-top-level RawStmt nodes in some utility statements. 
> a wart from gram.y's perspective, and it's mostly a wart from analyze.c's
> perspective as well --- the parse analyze routines mostly just throw away
> the non-top-level RawStmt.
>
> The original reason for doing it was that DoCopy needs to call
> pg_analyze_and_rewrite() on the sub-statement, and I wanted
> pg_analyze_and_rewrite's argument to be declared as RawStmt,

My 0,02€, feel free to ignore them:

Personnaly when I had started doing a version I had decided to only change 
the type at top level, and then I made a few functions being resilient 
about having a RawStmt (that I had called ParsedStmt in my version) or
a direct statement, rather than change the type, I had kept Node*.

Now I see the benefit of changing the type, because the compiler will say 
if there is an issue, and their is no hidden level changes.

> So I'm now thinking that it might be better if the grammar produced
> RawStmt only at top level, and anybody who calls pg_analyze_and_rewrite
> on sub-sections of a utility statement has to cons up a RawStmt to put
> at the top of the sub-query.

Why not. The lazy programmer I am notices that there seems to be 6 
instances, this is not too bad, some of which are already dealt with. The 
RawStmt may not need to be allocated dynamically, a stack instance could 
be enough.

-- 
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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-13 19:06  Tom Lane <[email protected]>
  parent: Fabien COELHO <[email protected]>
  0 siblings, 1 reply; 1109+ messages in thread

From: Tom Lane @ 2017-01-13 19:06 UTC (permalink / raw)
  To: Fabien COELHO <[email protected]>; +Cc: Craig Ringer <[email protected]>; Kyotaro HORIGUCHI <[email protected]>; Robert Haas <[email protected]>; pgsql-hackers

Fabien COELHO <[email protected]> writes:
>> One thing that I'm not quite satisfied with is the business with
>> non-top-level RawStmt nodes in some utility statements. 
>> ...
>> So I'm now thinking that it might be better if the grammar produced
>> RawStmt only at top level, and anybody who calls pg_analyze_and_rewrite
>> on sub-sections of a utility statement has to cons up a RawStmt to put
>> at the top of the sub-query.

> Why not. The lazy programmer I am notices that there seems to be 6 
> instances, this is not too bad, some of which are already dealt with. The 
> RawStmt may not need to be allocated dynamically, a stack instance could 
> be enough.

Here's a v2 that does it like that.  It ends up being about 30 fewer lines
of code overall, despite there being four places that have to make ad-hoc
RawStmt nodes.  On the whole I feel like this is cleaner, although there's
room to argue that.  Still, the extra cruft is in places that I'm
suspicious are wrong anyway, as I noted.

			regards, tom lane



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Attachments:

  [application/x-gzip] stmt-list-rewrite-2.patch.gz (38.6K, ../../[email protected]/2-stmt-list-rewrite-2.patch.gz)
  download

^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-13 22:22  Fabien COELHO <[email protected]>
  parent: Tom Lane <[email protected]>
  0 siblings, 1 reply; 1109+ messages in thread

From: Fabien COELHO @ 2017-01-13 22:22 UTC (permalink / raw)
  To: Tom Lane <[email protected]>; +Cc: Craig Ringer <[email protected]>; Kyotaro HORIGUCHI <[email protected]>; Robert Haas <[email protected]>; pgsql-hackers


> Here's a v2 that does it like that.

Applies, compiles, overall & pgss make check are both ok.

Personnally I find having RawStmt only for the top parsed statement 
cleaner, and it significantly reduces changes in the parser, as expected, 
without inducing too much changes elsewhere.

Same comment as on v1: I'm wondering about the actual coverage of the 
default tests... I cannot say I understand everything.

> It ends up being about 30 fewer lines of code overall, despite there 
> being four places that have to make ad-hoc RawStmt nodes.  On the whole 
> I feel like this is cleaner,

I agree: Better typing, more homogeneous code (PlannedStmt for all), 
less ad-hoc checks to work around utility statements...

-- 
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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-14 21:18  Tom Lane <[email protected]>
  parent: Fabien COELHO <[email protected]>
  0 siblings, 1 reply; 1109+ messages in thread

From: Tom Lane @ 2017-01-14 21:18 UTC (permalink / raw)
  To: Fabien COELHO <[email protected]>; +Cc: Craig Ringer <[email protected]>; Kyotaro HORIGUCHI <[email protected]>; Robert Haas <[email protected]>; pgsql-hackers

Fabien COELHO <[email protected]> writes:
>> It ends up being about 30 fewer lines of code overall, despite there 
>> being four places that have to make ad-hoc RawStmt nodes.  On the whole 
>> I feel like this is cleaner,

> I agree: Better typing, more homogeneous code (PlannedStmt for all), 
> less ad-hoc checks to work around utility statements...

OK, pushed like that.

			regards, tom lane


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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-26 02:38  Craig Ringer <[email protected]>
  parent: Tom Lane <[email protected]>
  0 siblings, 1 reply; 1109+ messages in thread

From: Craig Ringer @ 2017-01-26 02:38 UTC (permalink / raw)
  To: Tom Lane <[email protected]>; +Cc: Fabien COELHO <[email protected]>; Kyotaro HORIGUCHI <[email protected]>; Robert Haas <[email protected]>; pgsql-hackers

On 15 January 2017 at 05:18, Tom Lane <[email protected]> wrote:
> Fabien COELHO <[email protected]> writes:
>>> It ends up being about 30 fewer lines of code overall, despite there
>>> being four places that have to make ad-hoc RawStmt nodes.  On the whole
>>> I feel like this is cleaner,
>
>> I agree: Better typing, more homogeneous code (PlannedStmt for all),
>> less ad-hoc checks to work around utility statements...
>
> OK, pushed like that.


Thanks very much for that Tom, it's great to see this change.

One suggestion: it's currently non-obvious that ProcessUtility_hook
gets called with the full text of all parts of a multi-statement. I
suggest the following wording added to the comment on ProcessUtility()
in src/backend/tcop/utility.c, after the note on the query string, or
something like it:


  The same query string may be passed to multiple invocations of ProcessUtility
  if a utility statement in turn invokes other utility statements, or if the
  user supplied a query string containing multiple semicolon-separated
  statements in a single protocol message. It is also possible for the query
  text to contain other non-utility-statement text like comments, empty
  statements, and plannable statements. Callers that use the queryString
  should use pstmt->stmt_location and pstmt->stmt_len to extract the text for
  the statement of interest and should guard against re-entrant invocation.


That should help with at least some of the traps around
ProcessUtility_hook, and I certainly wish I'd known it some months
ago.



For the record, this is commits
ab1f0c8225714aaa18d2f9ca4f80cd009f145421 and
83f2061dd037477ec8479ee160367840e203a722 .

https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=ab1f0c8225714aaa18d2f9ca4f80cd009f145...

https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=83f2061dd037477ec8479ee160367840e203a...

-- 
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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-26 13:42  Tom Lane <[email protected]>
  parent: Craig Ringer <[email protected]>
  0 siblings, 1 reply; 1109+ messages in thread

From: Tom Lane @ 2017-01-26 13:42 UTC (permalink / raw)
  To: Craig Ringer <[email protected]>; +Cc: Fabien COELHO <[email protected]>; Kyotaro HORIGUCHI <[email protected]>; Robert Haas <[email protected]>; pgsql-hackers

Craig Ringer <[email protected]> writes:
> One suggestion: it's currently non-obvious that ProcessUtility_hook
> gets called with the full text of all parts of a multi-statement.

OK, we can improve that ...

>   The same query string may be passed to multiple invocations of ProcessUtility
>   if a utility statement in turn invokes other utility statements, or if the
>   user supplied a query string containing multiple semicolon-separated
>   statements in a single protocol message. It is also possible for the query
>   text to contain other non-utility-statement text like comments, empty
>   statements, and plannable statements. Callers that use the queryString
>   should use pstmt->stmt_location and pstmt->stmt_len to extract the text for
>   the statement of interest and should guard against re-entrant invocation.

Not sure about the reference to re-entrancy.  It's not especially relevant
to query texts AFAICS, and wouldn't a utility statement know darn well if
it was doing something that could end up invoking another instance of
itself?

			regards, tom lane


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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-26 23:22  Craig Ringer <[email protected]>
  parent: Tom Lane <[email protected]>
  0 siblings, 1 reply; 1109+ messages in thread

From: Craig Ringer @ 2017-01-26 23:22 UTC (permalink / raw)
  To: Tom Lane <[email protected]>; +Cc: Fabien COELHO <[email protected]>; Kyotaro HORIGUCHI <[email protected]>; Robert Haas <[email protected]>; pgsql-hackers

On 26 January 2017 at 21:42, Tom Lane <[email protected]> wrote:
> Craig Ringer <[email protected]> writes:
>> One suggestion: it's currently non-obvious that ProcessUtility_hook
>> gets called with the full text of all parts of a multi-statement.
>
> OK, we can improve that ...
>
>>   The same query string may be passed to multiple invocations of ProcessUtility
>>   if a utility statement in turn invokes other utility statements, or if the
>>   user supplied a query string containing multiple semicolon-separated
>>   statements in a single protocol message. It is also possible for the query
>>   text to contain other non-utility-statement text like comments, empty
>>   statements, and plannable statements. Callers that use the queryString
>>   should use pstmt->stmt_location and pstmt->stmt_len to extract the text for
>>   the statement of interest and should guard against re-entrant invocation.
>
> Not sure about the reference to re-entrancy.  It's not especially relevant
> to query texts AFAICS, and wouldn't a utility statement know darn well if
> it was doing something that could end up invoking another instance of
> itself?

The utility statement does, but the hooks don't necessarily. If you fire an

ALTER TABLE ...
  ADD COLUMN ..
  ADD COLUMN ..
  ADD CONSTRAINT ..;

for example.

However, I was wrong to say we must guard against re-entrancy. We
should only enter ProcessUtility once with context ==
PROCESS_UTILITY_QUERY, and that's what hooks should be looking at
rather than keeping track of re-entrant invocations.

So perhaps:


"The same query string may be passed to multiple invocations of
ProcessUtility if a utility statement invokes subcommands (e.g. ALTER
TABLE), in which case context will be set to
PROCESS_UTILITY_SUBCOMMAND, or if the user supplied a query string
containing multiple semicolon-separated statements in a single
protocol message. It is also possible for the query text to contain
other non-utility-statement text like comments, empty  statements, and
plannable statements that don't pass through ProcessUtility. Hooks
that use the queryString should use pstmt->stmt_location and
pstmt->stmt_len to extract the text for the statement of interest and
should pay attention to the context to avoid repeatedly handling the
same query string in subcommands."



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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-27 03:34  Tom Lane <[email protected]>
  parent: Craig Ringer <[email protected]>
  0 siblings, 2 replies; 1109+ messages in thread

From: Tom Lane @ 2017-01-27 03:34 UTC (permalink / raw)
  To: Craig Ringer <[email protected]>; +Cc: Fabien COELHO <[email protected]>; Kyotaro HORIGUCHI <[email protected]>; Robert Haas <[email protected]>; pgsql-hackers

Craig Ringer <[email protected]> writes:
> So perhaps:

> "The same query string may be passed to multiple invocations of
> ProcessUtility if a utility statement invokes subcommands (e.g. ALTER
> TABLE), in which case context will be set to
> PROCESS_UTILITY_SUBCOMMAND, or if the user supplied a query string
> containing multiple semicolon-separated statements in a single
> protocol message. It is also possible for the query text to contain
> other non-utility-statement text like comments, empty  statements, and
> plannable statements that don't pass through ProcessUtility. Hooks
> that use the queryString should use pstmt->stmt_location and
> pstmt->stmt_len to extract the text for the statement of interest and
> should pay attention to the context to avoid repeatedly handling the
> same query string in subcommands."

Meh.  I really don't think that a comment about the query string is
the place to get into promises that are unrelated to the string, and
that ProcessUtility is in no position to enforce anyway.  How about
we just say this:

"The same queryString may be passed to multiple invocations of
ProcessUtility when processing a query string containing multiple
semicolon-separated statements; one should use pstmt->stmt_location and
pstmt->stmt_len to identify the substring containing the current
statement.  Keep in mind also that some utility statements (e.g.,
CREATE SCHEMA) will recurse to ProcessUtility to process sub-statements,
often passing down the same queryString, stmt_location, and stmt_len
that were given for the whole statement."

			regards, tom lane


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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-27 07:36  Kyotaro HORIGUCHI <[email protected]>
  parent: Tom Lane <[email protected]>
  1 sibling, 1 reply; 1109+ messages in thread

From: Kyotaro HORIGUCHI @ 2017-01-27 07:36 UTC (permalink / raw)
  To: [email protected]; +Cc: [email protected]; [email protected]; [email protected]; pgsql-hackers

At Thu, 26 Jan 2017 22:34:57 -0500, Tom Lane <[email protected]> wrote in <[email protected]>
> Craig Ringer <[email protected]> writes:
> > So perhaps:
> 
> > "The same query string may be passed to multiple invocations of
> > ProcessUtility if a utility statement invokes subcommands (e.g. ALTER
> > TABLE), in which case context will be set to
> > PROCESS_UTILITY_SUBCOMMAND, or if the user supplied a query string
> > containing multiple semicolon-separated statements in a single
> > protocol message. It is also possible for the query text to contain
> > other non-utility-statement text like comments, empty  statements, and
> > plannable statements that don't pass through ProcessUtility. Hooks
> > that use the queryString should use pstmt->stmt_location and
> > pstmt->stmt_len to extract the text for the statement of interest and
> > should pay attention to the context to avoid repeatedly handling the
> > same query string in subcommands."
> 
> Meh.  I really don't think that a comment about the query string is
> the place to get into promises that are unrelated to the string, and
> that ProcessUtility is in no position to enforce anyway.  How about
> we just say this:
> 
> "The same queryString may be passed to multiple invocations of
> ProcessUtility when processing a query string containing multiple
> semicolon-separated statements; one should use pstmt->stmt_location and
> pstmt->stmt_len to identify the substring containing the current
> statement.  Keep in mind also that some utility statements (e.g.,
> CREATE SCHEMA) will recurse to ProcessUtility to process sub-statements,
> often passing down the same queryString, stmt_location, and stmt_len
> that were given for the whole statement."

Tom's rewrite is easier to read for me and seems telling me
enough as a user of the hook.

By the way the existing comment for the hook,

> *
> * We provide a function hook variable that lets loadable plugins get
> * control when ProcessUtility is called.  Such a plugin would normally
> * call standard_ProcessUtility().
> */

This is quite a matter of course for developers. planner_hook and
other ones don't have such a comment or have a one-liner at
most. Since this hook gets a good amount of commnet, it seems
better to just remove the existing one..

regards,

-- 
Kyotaro Horiguchi
NTT Open Source Software Center




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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-27 11:31  Craig Ringer <[email protected]>
  parent: Tom Lane <[email protected]>
  1 sibling, 1 reply; 1109+ messages in thread

From: Craig Ringer @ 2017-01-27 11:31 UTC (permalink / raw)
  To: Tom Lane <[email protected]>; +Cc: pgsql-hackers; Robert Haas <[email protected]>; Kyotaro HORIGUCHI <[email protected]>; Fabien COELHO <[email protected]>

On 27 Jan. 2017 14:34, "Tom Lane" <[email protected]> wrote:

Craig Ringer <[email protected]> writes:
> So perhaps:

> "The same query string may be passed to multiple invocations of
> ProcessUtility if a utility statement invokes subcommands (e.g. ALTER
> TABLE), in which case context will be set to
> PROCESS_UTILITY_SUBCOMMAND, or if the user supplied a query string
> containing multiple semicolon-separated statements in a single
> protocol message. It is also possible for the query text to contain
> other non-utility-statement text like comments, empty  statements, and
> plannable statements that don't pass through ProcessUtility. Hooks
> that use the queryString should use pstmt->stmt_location and
> pstmt->stmt_len to extract the text for the statement of interest and
> should pay attention to the context to avoid repeatedly handling the
> same query string in subcommands."

Meh.  I really don't think that a comment about the query string is
the place to get into promises that are unrelated to the string, and
that ProcessUtility is in no position to enforce anyway.  How about
we just say this:

"The same queryString may be passed to multiple invocations of
ProcessUtility when processing a query string containing multiple
semicolon-separated statements; one should use pstmt->stmt_location and
pstmt->stmt_len to identify the substring containing the current
statement.  Keep in mind also that some utility statements (e.g.,
CREATE SCHEMA) will recurse to ProcessUtility to process sub-statements,
often passing down the same queryString, stmt_location, and stmt_len
that were given for the whole statement."


Much better wording. I like that.


^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-27 15:03  Tom Lane <[email protected]>
  parent: Craig Ringer <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Tom Lane @ 2017-01-27 15:03 UTC (permalink / raw)
  To: Craig Ringer <[email protected]>; +Cc: pgsql-hackers; Robert Haas <[email protected]>; Kyotaro HORIGUCHI <[email protected]>; Fabien COELHO <[email protected]>

Craig Ringer <[email protected]> writes:
> On 27 Jan. 2017 14:34, "Tom Lane" <[email protected]> wrote:
>> "The same queryString may be passed to multiple invocations of
>> ProcessUtility when processing a query string containing multiple
>> semicolon-separated statements; one should use pstmt->stmt_location and
>> pstmt->stmt_len to identify the substring containing the current
>> statement.  Keep in mind also that some utility statements (e.g.,
>> CREATE SCHEMA) will recurse to ProcessUtility to process sub-statements,
>> often passing down the same queryString, stmt_location, and stmt_len
>> that were given for the whole statement."

> Much better wording. I like that.

OK, done that way.

			regards, tom lane


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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-27 15:08  Tom Lane <[email protected]>
  parent: Kyotaro HORIGUCHI <[email protected]>
  0 siblings, 1 reply; 1109+ messages in thread

From: Tom Lane @ 2017-01-27 15:08 UTC (permalink / raw)
  To: Kyotaro HORIGUCHI <[email protected]>; +Cc: [email protected]; [email protected]; [email protected]; pgsql-hackers

Kyotaro HORIGUCHI <[email protected]> writes:
> By the way the existing comment for the hook,

>> *
>> * We provide a function hook variable that lets loadable plugins get
>> * control when ProcessUtility is called.  Such a plugin would normally
>> * call standard_ProcessUtility().
>> */

> This is quite a matter of course for developers. planner_hook and
> other ones don't have such a comment or have a one-liner at
> most. Since this hook gets a good amount of commnet, it seems
> better to just remove the existing one..

Hm?  I see pretty much the same wording for planner_hook:

 * To support loadable plugins that monitor or modify planner behavior,
 * we provide a hook variable that lets a plugin get control before and
 * after the standard planning process.  The plugin would normally call
 * standard_planner().

I think other places have copied-and-pasted this as well.

The real problem with this is it isn't a correct specification of the
contract: in most cases, the right thing to do is more like "call the
previous occupant of the ProcessUtility_hook, or standard_ProcessUtility
if there was none."

Not sure if it's worth trying to be more precise in these comments,
but if we do something about it, we need to hit all the places with
this wording.

			regards, tom lane


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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-28 03:52  Craig Ringer <[email protected]>
  parent: Tom Lane <[email protected]>
  0 siblings, 1 reply; 1109+ messages in thread

From: Craig Ringer @ 2017-01-28 03:52 UTC (permalink / raw)
  To: Tom Lane <[email protected]>; +Cc: pgsql-hackers; Fabien COELHO <[email protected]>; [email protected]; Kyotaro HORIGUCHI <[email protected]>

On 28 Jan. 2017 02:08, "Tom Lane" <[email protected]> wrote:

Kyotaro HORIGUCHI <[email protected]> writes:
> By the way the existing comment for the hook,

>> *
>> * We provide a function hook variable that lets loadable plugins get
>> * control when ProcessUtility is called.  Such a plugin would normally
>> * call standard_ProcessUtility().
>> */

> This is quite a matter of course for developers. planner_hook and
> other ones don't have such a comment or have a one-liner at
> most. Since this hook gets a good amount of commnet, it seems
> better to just remove the existing one..

Hm?  I see pretty much the same wording for planner_hook:

 * To support loadable plugins that monitor or modify planner behavior,
 * we provide a hook variable that lets a plugin get control before and
 * after the standard planning process.  The plugin would normally call
 * standard_planner().

I think other places have copied-and-pasted this as well.

The real problem with this is it isn't a correct specification of the
contract: in most cases, the right thing to do is more like "call the
previous occupant of the ProcessUtility_hook, or standard_ProcessUtility
if there was none."

Not sure if it's worth trying to be more precise in these comments,
but if we do something about it, we need to hit all the places with
this wording.


I'd rather leave it for the hooks documentation work that's being done
elsewhere and have a README.hooks or something that discusses patterns
common across hooks. Then we can just reference it.

Otherwise we'll have a lot of repetitive comments. Especially once we
mention that you can also ERROR out or (potentially) take no action at all.


^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* Re: BUG: pg_stat_statements query normalization issues with combined queries
@ 2017-01-30 07:01  Kyotaro HORIGUCHI <[email protected]>
  parent: Craig Ringer <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Kyotaro HORIGUCHI @ 2017-01-30 07:01 UTC (permalink / raw)
  To: [email protected]; +Cc: [email protected]; pgsql-hackers; [email protected]; [email protected]

Mmm..

At Sat, 28 Jan 2017 11:52:20 +0800, Craig Ringer <[email protected]> wrote in <CAMsr+YGX0uU5Rw0fOKFwxtg_5WxWOBQ=KiTHWiKrb65H67inwg@mail.gmail.com>
> On 28 Jan. 2017 02:08, "Tom Lane" <[email protected]> wrote:
> 
> Kyotaro HORIGUCHI <[email protected]> writes:
> > By the way the existing comment for the hook,
> 
> >> *
> >> * We provide a function hook variable that lets loadable plugins get
> >> * control when ProcessUtility is called.  Such a plugin would normally
> >> * call standard_ProcessUtility().
> >> */
> 
> > This is quite a matter of course for developers. planner_hook and
> > other ones don't have such a comment or have a one-liner at
> > most. Since this hook gets a good amount of commnet, it seems
> > better to just remove the existing one..
> 
> Hm?  I see pretty much the same wording for planner_hook:

Sorry, my eyes were very short-ranged. Surely most of them have
commnents with very similar phrase. ExplainOneQuery seems to be
one exception but I'll call ExplainOneQuery in the hook function,
though:p

Anyway I don't want to remove the comment in ProcessUtility since
now I know that is rather the common case.

>  * To support loadable plugins that monitor or modify planner behavior,
>  * we provide a hook variable that lets a plugin get control before and
>  * after the standard planning process.  The plugin would normally call
>  * standard_planner().
> 
> I think other places have copied-and-pasted this as well.
> 
> The real problem with this is it isn't a correct specification of the
> contract: in most cases, the right thing to do is more like "call the
> previous occupant of the ProcessUtility_hook, or standard_ProcessUtility
> if there was none."
> 
> Not sure if it's worth trying to be more precise in these comments,
> but if we do something about it, we need to hit all the places with
> this wording.

That seems bad. I'll prefer rather leaving them alone. Modifying
them wouldn't be so much gain if many of them already have such
comment.

> I'd rather leave it for the hooks documentation work that's being done
> elsewhere and have a README.hooks or something that discusses patterns
> common across hooks. Then we can just reference it.
> 
> Otherwise we'll have a lot of repetitive comments. Especially once we
> mention that you can also ERROR out or (potentially) take no action at all.

Sorry for the noise..

regards,

-- 
Kyotaro Horiguchi
NTT Open Source Software Center




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^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2019-11-08 13:12  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2019-11-08 13:12 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size.

In psql, include a new "Free" column in \db+ output.
---
 doc/src/sgml/func.sgml          | 21 ++++++++
 doc/src/sgml/ref/psql-ref.sgml  |  2 +-
 src/backend/utils/adt/dbsize.c  | 94 +++++++++++++++++++++++++++++++++
 src/bin/psql/describe.c         | 11 ++--
 src/include/catalog/pg_proc.dat |  8 +++
 5 files changed, 132 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..3a2f47c50ec 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_bsize; /* available blocks times block size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
-- 
2.47.2


--vqKhBUYnSUFh3RIa--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v4] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  11 ++-
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 171 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..9bd8667c2d9 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--mxigUiQ2jY+Id+Rf--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func.sgml                   | 21 ++++++
 doc/src/sgml/ref/psql-ref.sgml           |  2 +-
 src/backend/utils/adt/dbsize.c           | 94 ++++++++++++++++++++++++
 src/bin/psql/describe.c                  | 11 ++-
 src/include/catalog/pg_proc.dat          |  8 ++
 src/test/regress/expected/tablespace.out | 21 ++++++
 src/test/regress/sql/tablespace.sql      | 10 +++
 7 files changed, 163 insertions(+), 4 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 51dd8ad6571..0b4456ad958 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -30093,6 +30093,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index cedccc14129..9e1bec0b422 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1492,7 +1492,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 25865b660ef..30e0cb8d111 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,11 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +321,95 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL) == false)
+		return -1;
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+		return -1;
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e6cf468ac9e..8c52a126ac1 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -241,10 +241,15 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 180000)
+			appendPQExpBuffer(&buf,
+							  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(oid)) AS \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 42e427f8fe8..9d64da6bfb8 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7680,6 +7680,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index a90e39e5738..6709ed794df 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index dfe3db096e2..3fcd4bb00ff 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.47.2


--65NGEM4fhwMw73YU--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread

* [PATCH v5] Add pg_tablespace_avail() functions
@ 2025-03-14 15:29  Christoph Berg <[email protected]>
  0 siblings, 0 replies; 1109+ messages in thread

From: Christoph Berg @ 2025-03-14 15:29 UTC (permalink / raw)

This exposes the f_avail value from statvfs() on tablespace directories
on the SQL level, allowing monitoring of free disk space from within the
server. On windows, GetDiskFreeSpaceEx() is used.

Permissions required match those from pg_tablespace_size().

In psql, include a new "Free" column in \db+ output.

Add test coverage for pg_tablespace_avail() and the previously not
covered pg_tablespace_size() function.
---
 doc/src/sgml/func/func-admin.sgml        |  21 +++++
 doc/src/sgml/ref/psql-ref.sgml           |   2 +-
 src/backend/utils/adt/dbsize.c           | 102 +++++++++++++++++++++++
 src/bin/psql/describe.c                  |  32 +++++--
 src/include/catalog/pg_proc.dat          |   8 ++
 src/test/regress/expected/tablespace.out |  21 +++++
 src/test/regress/sql/tablespace.sql      |  10 +++
 7 files changed, 189 insertions(+), 7 deletions(-)

diff --git a/doc/src/sgml/func/func-admin.sgml b/doc/src/sgml/func/func-admin.sgml
index 72038fc835f..959b0b673ab 100644
--- a/doc/src/sgml/func/func-admin.sgml
+++ b/doc/src/sgml/func/func-admin.sgml
@@ -1755,6 +1755,27 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
        </para></entry>
       </row>
 
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <indexterm>
+         <primary>pg_tablespace_avail</primary>
+        </indexterm>
+        <function>pg_tablespace_avail</function> ( <type>name</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para role="func_signature">
+        <function>pg_tablespace_avail</function> ( <type>oid</type> )
+        <returnvalue>bigint</returnvalue>
+       </para>
+       <para>
+        Returns the available disk space in the tablespace with the
+        specified name or OID. To use this function, you must
+        have <literal>CREATE</literal> privilege on the specified tablespace
+        or have privileges of the <literal>pg_read_all_stats</literal> role,
+        unless it is the default tablespace for the current database.
+       </para></entry>
+      </row>
+
       <row>
        <entry role="func_table_entry"><para role="func_signature">
         <indexterm>
diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 7c05afd4719..1ea67b3659f 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1501,7 +1501,7 @@ SELECT $1 \parse stmt1
         If <literal>x</literal> is appended to the command name, the results
         are displayed in expanded mode.
         If <literal>+</literal> is appended to the command name, each tablespace
-        is listed with its associated options, on-disk size, permissions and
+        is listed with its associated options, on-disk size and free disk space, permissions and
         description.
         </para>
         </listitem>
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index cccc4a24c84..b395824ca3f 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -12,6 +12,12 @@
 #include "postgres.h"
 
 #include <sys/stat.h>
+#ifdef WIN32
+#include <fileapi.h>
+#include <errhandlingapi.h>
+#else
+#include <sys/statvfs.h>
+#endif
 
 #include "access/htup_details.h"
 #include "access/relation.h"
@@ -316,6 +322,102 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
 }
 
 
+/*
+ * Return available disk space of tablespace. Returns -1 if the tablespace
+ * directory cannot be found.
+ */
+static int64
+calculate_tablespace_avail(Oid tblspcOid)
+{
+	char		tblspcPath[MAXPGPATH];
+	AclResult	aclresult;
+#ifdef WIN32
+	ULARGE_INTEGER lpFreeBytesAvailable;
+#else
+	struct statvfs fst;
+#endif
+
+	/*
+	 * User must have privileges of pg_read_all_stats or have CREATE privilege
+	 * for target tablespace, either explicitly granted or implicitly because
+	 * it is default for current database.
+	 */
+	if (tblspcOid != MyDatabaseTableSpace &&
+		!has_privs_of_role(GetUserId(), ROLE_PG_READ_ALL_STATS))
+	{
+		aclresult = object_aclcheck(TableSpaceRelationId, tblspcOid, GetUserId(), ACL_CREATE);
+		if (aclresult != ACLCHECK_OK)
+			aclcheck_error(aclresult, OBJECT_TABLESPACE,
+						   get_tablespace_name(tblspcOid));
+	}
+
+	if (tblspcOid == DEFAULTTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "base");
+	else if (tblspcOid == GLOBALTABLESPACE_OID)
+		snprintf(tblspcPath, MAXPGPATH, "global");
+	else
+		snprintf(tblspcPath, MAXPGPATH, "%s/%u/%s", PG_TBLSPC_DIR, tblspcOid,
+				 TABLESPACE_VERSION_DIRECTORY);
+
+#ifdef WIN32
+	if (! GetDiskFreeSpaceEx(tblspcPath, &lpFreeBytesAvailable, NULL, NULL))
+		elog(ERROR, "GetDiskFreeSpaceEx failed: error code %lu", GetLastError());
+
+	return lpFreeBytesAvailable.QuadPart; /* ULONGLONG part of ULARGE_INTEGER */
+#else
+	if (statvfs(tblspcPath, &fst) < 0)
+	{
+		if (errno == ENOENT)
+			return -1;
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not statvfs directory \"%s\": %m", tblspcPath)));
+	}
+
+	return fst.f_bavail * fst.f_frsize; /* available blocks times fragment size */
+#endif
+}
+
+Datum
+pg_tablespace_avail_oid(PG_FUNCTION_ARGS)
+{
+	Oid			tblspcOid = PG_GETARG_OID(0);
+	int64		avail;
+
+	/*
+	 * Not needed for correctness, but avoid non-user-facing error message
+	 * later if the tablespace doesn't exist.
+	 */
+	if (!SearchSysCacheExists1(TABLESPACEOID, ObjectIdGetDatum(tblspcOid)))
+		ereport(ERROR,
+				errcode(ERRCODE_UNDEFINED_OBJECT),
+				errmsg("tablespace with OID %u does not exist", tblspcOid));
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+Datum
+pg_tablespace_avail_name(PG_FUNCTION_ARGS)
+{
+	Name		tblspcName = PG_GETARG_NAME(0);
+	Oid			tblspcOid = get_tablespace_oid(NameStr(*tblspcName), false);
+	int64		avail;
+
+	avail = calculate_tablespace_avail(tblspcOid);
+
+	if (avail < 0)
+		PG_RETURN_NULL();
+
+	PG_RETURN_INT64(avail);
+}
+
+
 /*
  * calculate size of (one fork of) a relation
  *
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index e1449654f96..36486417a48 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -234,7 +234,7 @@ describeTablespaces(const char *pattern, bool verbose)
 	appendPQExpBuffer(&buf,
 					  "SELECT spcname AS \"%s\",\n"
 					  "  pg_catalog.pg_get_userbyid(spcowner) AS \"%s\",\n"
-					  "  pg_catalog.pg_tablespace_location(oid) AS \"%s\"",
+					  "  pg_catalog.pg_tablespace_location(tblspc.oid) AS \"%s\"",
 					  gettext_noop("Name"),
 					  gettext_noop("Owner"),
 					  gettext_noop("Location"));
@@ -245,15 +245,34 @@ describeTablespaces(const char *pattern, bool verbose)
 		printACLColumn(&buf, "spcacl");
 		appendPQExpBuffer(&buf,
 						  ",\n  spcoptions AS \"%s\""
-						  ",\n  pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS \"%s\""
-						  ",\n  pg_catalog.shobj_description(oid, 'pg_tablespace') AS \"%s\"",
+						  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+						  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(tblspc.oid))\n"
+						  "       ELSE 'No Access'"
+						  "  END as \"%s\"",
 						  gettext_noop("Options"),
-						  gettext_noop("Size"),
+						  gettext_noop("Size"));
+		if (pset.sversion >= 190000)
+			appendPQExpBuffer(&buf,
+							  ",\n  CASE WHEN dbsub.dattablespace OPERATOR(pg_catalog.=) tblspc.oid OR\n"
+							  "               pg_catalog.has_tablespace_privilege(tblspc.oid, 'CREATE') OR\n"
+							  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
+							  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_avail(tblspc.oid))\n"
+							  "       ELSE 'No Access'"
+							  "  END as \"%s\"",
+							  gettext_noop("Free"));
+		appendPQExpBuffer(&buf,
+						  ",\n  pg_catalog.shobj_description(tblspc.oid, 'pg_tablespace') AS \"%s\"",
 						  gettext_noop("Description"));
 	}
 
 	appendPQExpBufferStr(&buf,
-						 "\nFROM pg_catalog.pg_tablespace\n");
+						 "\nFROM pg_catalog.pg_tablespace tblspc\n");
+	if (verbose)
+		appendPQExpBufferStr(&buf,
+							 "CROSS JOIN (SELECT dattablespace FROM pg_catalog.pg_database db\n"
+							 "  wHERE db.datname OPERATOR(pg_catalog.=) pg_catalog.current_database()) dbsub\n");
 
 	if (!validateSQLNamePattern(&buf, pattern, false, false,
 								NULL, "spcname", NULL,
@@ -1008,7 +1027,8 @@ listAllDbs(const char *pattern, bool verbose)
 	printACLColumn(&buf, "d.datacl");
 	if (verbose)
 		appendPQExpBuffer(&buf,
-						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')\n"
+						  ",\n  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') OR\n"
+						  "               pg_catalog.pg_has_role('pg_read_all_stats', 'USAGE')\n"
 						  "       THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))\n"
 						  "       ELSE 'No Access'\n"
 						  "  END as \"%s\""
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index fa9ae79082b..78c03ea6412 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -7866,6 +7866,14 @@
   descr => 'total disk space usage for the specified tablespace',
   proname => 'pg_tablespace_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'name', prosrc => 'pg_tablespace_size_name' },
+{ oid => '6015',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'oid', prosrc => 'pg_tablespace_avail_oid' },
+{ oid => '6016',
+  descr => 'disk stats for the specified tablespace',
+  proname => 'pg_tablespace_avail', provolatile => 'v', prorettype => 'int8',
+  proargtypes => 'name', prosrc => 'pg_tablespace_avail_name' },
 { oid => '2324', descr => 'total disk space usage for the specified database',
   proname => 'pg_database_size', provolatile => 'v', prorettype => 'int8',
   proargtypes => 'oid', prosrc => 'pg_database_size_oid' },
diff --git a/src/test/regress/expected/tablespace.out b/src/test/regress/expected/tablespace.out
index f0dd25cdf0c..12a78c77e05 100644
--- a/src/test/regress/expected/tablespace.out
+++ b/src/test/regress/expected/tablespace.out
@@ -20,6 +20,27 @@ SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
  {random_page_cost=3.0}
 (1 row)
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+ ?column? | ?column? | pg_tablespace_size 
+----------+----------+--------------------
+ t        | t        |                  0
+(1 row)
+
+SELECT pg_tablespace_size('missing');
+ERROR:  tablespace "missing" does not exist
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+ ?column? | ?column? | ?column? 
+----------+----------+----------
+ t        | t        | t
+(1 row)
+
+SELECT pg_tablespace_avail('missing');
+ERROR:  tablespace "missing" does not exist
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 -- This returns a relative path as of an effect of allow_in_place_tablespaces,
diff --git a/src/test/regress/sql/tablespace.sql b/src/test/regress/sql/tablespace.sql
index c43a59e5957..91152335459 100644
--- a/src/test/regress/sql/tablespace.sql
+++ b/src/test/regress/sql/tablespace.sql
@@ -17,6 +17,16 @@ CREATE TABLESPACE regress_tblspacewith LOCATION '' WITH (random_page_cost = 3.0)
 -- check to see the parameter was used
 SELECT spcoptions FROM pg_tablespace WHERE spcname = 'regress_tblspacewith';
 
+-- check size functions
+SELECT pg_tablespace_size('pg_default') BETWEEN 1_000_000 and 10_000_000_000, -- rough sanity check
+       pg_tablespace_size('pg_global') BETWEEN 100_000 and 10_000_000,
+       pg_tablespace_size('regress_tblspacewith'); -- empty
+SELECT pg_tablespace_size('missing');
+SELECT pg_tablespace_avail('pg_default') > 1_000_000,
+       pg_tablespace_avail('pg_global') > 1_000_000,
+       pg_tablespace_avail('regress_tblspacewith') > 1_000_000;
+SELECT pg_tablespace_avail('missing');
+
 -- drop the tablespace so we can re-use the location
 DROP TABLESPACE regress_tblspacewith;
 
-- 
2.53.0


--sW4eVZZF7egqrnKF--





^ permalink  raw  reply  [nested|flat] 1109+ messages in thread


end of thread, other threads:[~2025-03-14 15:29 UTC | newest]

Thread overview: 1109+ messages (download: mbox mbox.gz follow: Atom feed)
-- links below jump to the message on this page --
2017-01-12 13:12 Re: BUG: pg_stat_statements query normalization issues with combined queries Kyotaro HORIGUCHI <[email protected]>
2017-01-12 14:29 ` Tom Lane <[email protected]>
2017-01-12 18:00   ` Fabien COELHO <[email protected]>
2017-01-12 18:25     ` Tom Lane <[email protected]>
2017-01-12 18:41       ` Tom Lane <[email protected]>
2017-01-12 19:08         ` Fabien COELHO <[email protected]>
2017-01-13 08:35           ` Kyotaro HORIGUCHI <[email protected]>
2017-01-13 14:08             ` Craig Ringer <[email protected]>
2017-01-13 14:44               ` Tom Lane <[email protected]>
2017-01-13 17:00                 ` Fabien COELHO <[email protected]>
2017-01-13 19:06                   ` Tom Lane <[email protected]>
2017-01-13 22:22                     ` Fabien COELHO <[email protected]>
2017-01-14 21:18                       ` Tom Lane <[email protected]>
2017-01-26 02:38                         ` Craig Ringer <[email protected]>
2017-01-26 13:42                           ` Tom Lane <[email protected]>
2017-01-26 23:22                             ` Craig Ringer <[email protected]>
2017-01-27 03:34                               ` Tom Lane <[email protected]>
2017-01-27 07:36                                 ` Kyotaro HORIGUCHI <[email protected]>
2017-01-27 15:08                                   ` Tom Lane <[email protected]>
2017-01-28 03:52                                     ` Craig Ringer <[email protected]>
2017-01-30 07:01                                       ` Kyotaro HORIGUCHI <[email protected]>
2017-01-27 11:31                                 ` Craig Ringer <[email protected]>
2017-01-27 15:03                                   ` Tom Lane <[email protected]>
2017-01-12 19:02       ` Fabien COELHO <[email protected]>
2017-01-13 08:34     ` Kyotaro HORIGUCHI <[email protected]>
2017-01-13 14:01       ` Tom Lane <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2019-11-08 13:12 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v4] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH v5] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>
2025-03-14 15:29 [PATCH] Add pg_tablespace_avail() functions Christoph Berg <[email protected]>

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